My usual stop for Starbucks on those days I think I need one (If it's Monday, that's good enough reason). Never had a problem here - staff is always courteous, gets my order right, and the line moves quickly. Haven't had any issues with coupons either, and the coffee is always fairly consistent in quality. Can't speak to the accuracy or quality of their food items as I tend to stick with just coffee..
Store is long and narrow but no issues - I've never sat down there and it might not be the Starbucks with the greatest ambience (the one on Main St. Unionville is much nicer), but you'll be comfortable, and it's fairly quiet.
Another reviewer said that the Google Maps location wasn't accurate - I checked and it looks accurate now, so all is well in the internets.
Just a tip - there's lots of parking but if you want to be lazy and get closer to the door, you can park in the Scotiabank courtesy spots if it's early and the bank hasn't yet opened (it opens at 9:30).